Mary Kay's annual US Leadership Conference has brought nearly 11,000 attendees—and $12.9 million in direct visitor spending—to New Orleans. The beauty brand and direct seller kicked off its annual event yesterday at the New Orleans Ernest N. Morial Convention Center.    To support Mary Kay's commitment to preventing and ending domestic violence with its Don't Look Away program, attendees will assemble 2,000 care kits during the conference to distribute to six local domestic viol...